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Spotting a star's wobble
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<blockquote data-quote="Umbran" data-source="post: 5806519" data-attributes="member: 177"><p>Can't? Well, it isn't physically impossible for them to come to a conclusion more quickly - how long it takes depends on the star and planets invovled. Nor is it like there's some law against it, and they're going to get arrested if they release findings sooner than that.</p><p></p><p>That being said, this method does take a while. Good measurements have to factor out the Earth's motion around the Sun, and that's easiest to do if you take measurements over more than one of our years.</p><p></p><p>And if you want the best data, you also want to take data over the course of multiple wobble-cycles of the target star. That means multiple orbits of the suspected planet. Depending on the planet's orbit, that could take several of our years. If you were trying to detect Jupiter using this method, for example, you're talking about taking measurements over 12 years or more to get just one wobble-cycle.</p><p></p><p>For interested folks, the Wikipedia page on the subject looks pretty good, at least to my cursory inspection:</p><p></p><p><a href="http://en.wikipedia.org/wiki/Doppler_spectroscopy" target="_blank">Doppler spectroscopy - Wikipedia, the free encyclopedia</a></p></blockquote><p></p>
[QUOTE="Umbran, post: 5806519, member: 177"] Can't? Well, it isn't physically impossible for them to come to a conclusion more quickly - how long it takes depends on the star and planets invovled. Nor is it like there's some law against it, and they're going to get arrested if they release findings sooner than that. That being said, this method does take a while. Good measurements have to factor out the Earth's motion around the Sun, and that's easiest to do if you take measurements over more than one of our years. And if you want the best data, you also want to take data over the course of multiple wobble-cycles of the target star. That means multiple orbits of the suspected planet. Depending on the planet's orbit, that could take several of our years. If you were trying to detect Jupiter using this method, for example, you're talking about taking measurements over 12 years or more to get just one wobble-cycle. For interested folks, the Wikipedia page on the subject looks pretty good, at least to my cursory inspection: [url=http://en.wikipedia.org/wiki/Doppler_spectroscopy]Doppler spectroscopy - Wikipedia, the free encyclopedia[/url] [/QUOTE]
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